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Mademuasel [1]
3 years ago
14

A scientist designed a foam container to help keep frozen foods from melting. Which best explains how the foam works? It removes

thermal energy from the air inside the container. It removes thermal energy from the frozen foods inside the container. It reduces the amount of thermal energy that is transferred from inside to outside the container. It reduces the amount of thermal energy that is transferred from outside to inside the container.
Physics
1 answer:
Allushta [10]3 years ago
6 0

Answer:

the foam an insulator............

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Which object is created during the formation of a star? a nebula a protostar a supergiant a supernova
Lady bird [3.3K]

Answer:

A. a nebula

Explanation:

hope this helps

3 0
3 years ago
When the temperature of 2.35 m^3 of a liquid is increased by 48.5 degrees Celsius, it expands by 0.0920 m^3. What is its coeffic
Nuetrik [128]

Answer:

8.1\cdot 10^{-4} C^{-1}

Explanation:

The volumetric expansion of the liquid is given by

\Delta V=\alpha V_0 \Delta T

where

\alpha is the coefficient of volume expansion

V_0 is the initial volume

\Delta T is the change in temperature

For the liquid in this problem,

V_0 = 2.35 m^3\\\Delta T=48.5^{\circ}C\\\Delta V=0.0920 m^3

So we can solve the equation to find \alpha:

\alpha=\frac{\Delta V}{V_0 \Delta T}=\frac{(0.0920 m^3)}{(2.35 m^3)(48.5^{\circ}C)}=8.1\cdot 10^{-4} C^{-1}

7 0
4 years ago
Optical tweezers use light from a laser to move single atoms and molecules around. Suppose the intensity of light from the tweez
Zanzabum

(a)  3.3\cdot 10^{-6} Pa

The radiation pressure exerted by an electromagnetic wave on a surface that totally absorbs the radiation is given by

p=\frac{I}{c}

where

I is the intensity of the wave

c is the speed of light

In this problem,

I=1000 W/m^2

and substituting c=3\cdot 10^8 m/s, we find the radiation pressure

p=\frac{1000 W/m^2}{3\cdot 10^8 m/s}=3.3\cdot 10^{-6}Pa

(b) 4.4\cdot 10^{-8} m/s^2

Since we know the cross-sectional area of the laser beam:

A=6.65\cdot 10^{-29}m^2

starting from the radiation pressure found at point (a), we can calculate the force exerted on a tritium atom:

F=pa=(3.3\cdot 10^{-6}Pa)(6.65\cdot 10^{-29} m^2)=2.2\cdot 10^{-34}N

And then, since we know the mass of the atom

m=5.01\cdot 10^{-27}kg

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a=\frac{F}{m}=\frac{2.2\cdot 10^{-34} N}{5.01\cdot 10^{-27} kg}=4.4\cdot 10^{-8} m/s^2

6 0
4 years ago
What happens to the speed of an object when dropped at free fall
dedylja [7]

If it's not falling through air, water, smoke, or anything else,
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4 years ago
I need help. <br> How do I fill this out?
enyata [817]

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6 0
3 years ago
Read 2 more answers
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